Adiós, ancient coastal cities

Global sea level rise has long been a predicted consequence of global warming, as massive ice sheets at the poles and on mountaintops pour their melted water into the sea. (Pumping groundwater out of aquifers and onto land (which then ultimately drains into the sea) is also a culprit.) Coastal cities are already bearing the brunt of sea level rise, from aquifer incursion (making water too saline to use) to overwhelming sea walls and stormwater infrastructure.